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fix: Make mocked data lazy-loaded #900

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fix: Make mocked data lazy-loaded #900

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ae24de9
chg: Make mocked data lazy-loaded
hangy Oct 25, 2022
6111a9a
test: Re-add MockFileInfo_Exists_* test
hangy Oct 26, 2022
4069e71
test: Rename test to reflect that it is actually about lazy-loading
hangy Oct 26, 2022
2b28435
fix(test): Call `Refresh()` in the Arrange phase
hangy Oct 26, 2022
e769dfc
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hangy Oct 26, 2022
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25 changes: 25 additions & 0 deletions tests/System.IO.Abstractions.TestingHelpers.Tests/MockFileInfoTests.cs
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Expand Up @@ -793,13 +793,32 @@ public void MockFileInfo_Replace_ShouldThrowIfDestinationFileDoesNotExist()
Assert.Throws<FileNotFoundException>(() => fileInfo.Replace(path2, null));
}

[Test]
public void MockFileInfo_Exists_LazyLoadsData()
{
// Arrange
var fileSystem = new MockFileSystem();
var path1 = XFS.Path(@"c:\temp\file1.txt");
var fileInfo = fileSystem.FileInfo.FromFileName(path1);
var cachedFileInfo = fileSystem.FileInfo.FromFileName(path1);
_ = cachedFileInfo.Exists; // this forces a lazyload of the data.

// Act
fileSystem.AddFile(path1, new MockFileData("1"));

// Assert
Assert.IsTrue(fileInfo.Exists);
Assert.IsFalse(cachedFileInfo.Exists, "Cached MockFileInfo should still return the cached value");
}

[Test]
public void MockFileInfo_Exists_ShouldUpdateCachedDataOnRefresh()
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{
// Arrange
var fileSystem = new MockFileSystem();
var path1 = XFS.Path(@"c:\temp\file1.txt");
var fileInfo = fileSystem.FileInfo.FromFileName(path1);
fileInfo.Refresh();
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// Act
fileSystem.AddFile(path1, new MockFileData("1"));
Expand All @@ -812,9 +831,11 @@ public void MockFileInfo_Exists_ShouldUpdateCachedDataOnRefresh()
[Test]
public void MockFileInfo_Create_ShouldUpdateCachedDataAndReturnTrueForExists()
{
// Arrange
IFileSystem fileSystem = new MockFileSystem();
var path = XFS.Path(@"c:\temp\file1.txt");
IFileInfo fileInfo = fileSystem.FileInfo.FromFileName(path);
fileInfo.Refresh();
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// Act
fileInfo.Create().Dispose();
Expand All @@ -827,9 +848,11 @@ public void MockFileInfo_Create_ShouldUpdateCachedDataAndReturnTrueForExists()
[Test]
public void MockFileInfo_CreateText_ShouldUpdateCachedDataAndReturnTrueForExists()
{
// Arrange
IFileSystem fileSystem = new MockFileSystem();
var path = XFS.Path(@"c:\temp\file1.txt");
IFileInfo fileInfo = fileSystem.FileInfo.FromFileName(path);
fileInfo.Refresh();
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// Act
fileInfo.CreateText().Dispose();
Expand All @@ -841,9 +864,11 @@ public void MockFileInfo_CreateText_ShouldUpdateCachedDataAndReturnTrueForExists
[Test]
public void MockFileInfo_Delete_ShouldUpdateCachedDataAndReturnFalseForExists()
{
// Arrange
var fileSystem = new MockFileSystem();
var path = XFS.Path(@"c:\temp\file1.txt");
IFileInfo fileInfo = fileSystem.FileInfo.FromFileName(path);
fileInfo.Refresh();
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// Act
fileInfo.Delete();
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2 changes: 1 addition & 1 deletion tests/System.IO.Abstractions.TestingHelpers.Tests/MockFileSystemTests.cs
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Expand Up @@ -231,7 +231,7 @@ public void MockFileSystem_AddFile_ShouldMatchCapitalization_PartialMatch_Furthe
}

[Test]
public void MockFileSystem_AddFile_ShouldMarkFileAsExisting()
public void MockFileSystem_FileInfoExists_ShouldBeTrueIfAFileWasAddedBeforeMockFileDataWasLazyLoaded()
{
// Arrange
var fileSystem = new MockFileSystem();
Expand Down